Brake mechanism



June 17, 1930. AYD D 1,765,351

BRAKE MECHANISM Original Filed 001;. 8, 1924 mvENToR ATT'oRHEYs Patented June 17, 1930 UNITED STATES PATENT OFFICE ADIEL Y, Donen, or son'rn BEND, INDIANA, nssrenon TO BENDIXZBRAKE comrnnv,

- A conronarron on rumors BRAKE MECHANISM Original application filed October}, 19 24,'Seria1 No. 742,282. Divided-and this application filed May 16,

1928. Serial My invention relates to improvements in brake mechanism and is illustrated as embodied in internal brake mechanism particularly adapted for use on .a motor vehicle.

- The. invention is illustrated as comprising a pair of pivotally connected brake shoes provided with novel operating and supporting mechanism including a floating wedfe riding over the face of a cam to be urge against the shoes to force them against the rotatable member and swinging linkage which carries are mounted upon a by the backing the pivotal connection between the vshoes whereby one shoe serves to exercise a servo action upon the other shoe depending upon the direction of rotation of the drum.

Otheradvantages and meritorious features of my improved construction will appear from the following specification appended claims and. accompanying drawing, where- 1n y Fig. 1 is a vertical sectional view through a brake drum showing the brake shoes and ap-- plying means in elevation.

Fig. 2 is a vertical section support for the brake.

This application is a division of my application, Ser. N 0. 742,282, filed October 8,1924, now patent No. 1,705,855, dated March 19, 1929.

through the link The brake drum is indicated as 10. Two

substantially inflexible brake shoes 12 and 16 are arranged within the drum. These shoes are pivotally articulated as at 14. The opposite ends 22 and-26 of the shoes are slotted as at 24 and 28 and a stationary anchor carried plate 58 is mounted within each slot. Anchor 18 is mounted within the slot 24 to anchor the shoeswhen the drum is rotating in a counter-clockwise direction and anchor 20 is located within the slot 28 to anchor the shoes when the drum is rotating in a clockwise direction.

The pivotally connected ends of the shoespivot 14 carried by a,

swinging link 54 pivoted for swinging movement at 56.v x

A stop adjustment is shown at 62 and a reas 52. Operating apart and this operating mechanism is capaplate and carrying is turning in the opposite direction to apply I ti on ble of floating to adapt itselfto both the oper-- ative and the inoperative positions of the brake. i

The operating mechanism comprises a pull rod 50 pivoted at 48 to a link 46 to which is 55 connected a shaft 44 journaled in thebacking a cam 42to rotate there- This cam 42 engages for operation a wedge 34 pivoted at 36 to a link 38 journaled upon a pivot 40 in the backing plate so that actuation of the cam moves the wedge be tween the ends of the shoes 12 and 16. This wedge directly engages bearing rollers 30 and 32'carried by the extreme ends of the with.

shoes 12 and 16 respectively.

In the operation of the device when the cam is actuated to apply the shoes to the drum, if the drum is rotating in a clockwise direction,

shoe 16 anchors upon the anchor 20 and the shoe 12 is urged against the drum by the wedge 34 and in turn exerts a servo action upon'the shoe 16. The converse is'true if the drum is rotating in the opposite direction.

What I claim is:

1. Brake mechanism comprising, in combination with a rotatable brake drum, sub

stanti ally-inflexible brake shoes directly pivoted together and arranged within the drum having spaced apart free separable slotted ends, an anchor arranged within each slotted .endto anchor the shoes when the drum is rotating in the direction to bring either shoe against its anchor while permitting the said shoe to travel over the anchor when the drum the anchored shoe to the drum, a wedge member pivotally supported at the free end of'a pivotally mounted link, operating mechanism comprising a rotatably supported involute cam engaging thepivoted'end of said wedge member to urge it between the shoes to spread said shoes against the drum, and a swinging link supporting the pivotal connecbetween said shoes. 2. Brake mechanism comprising, in com bination' with a rotatable drum, friction means having separable ends arranged within the drum, an anchorage positioned in prox imity to the, separable ends of said friction means to anchor said means ineither direction of rotation of the drum engaging one end of said friction means when the drum 1s rotatlng in one dlrection and the other end of said means when the drum is rotating in the opposlte' dlIGCt-IOII a hnk havlng one end' mounted upon a. fixed pivot for swinging movement thereover and having a wedge pivotally swung from its opposite and free end, said wedge extending between the'separable ends of the friction'means and a cam disposed to be operated to exert a thrust upon said link to urge the wedge between the sepsaid means to the drum.

In testimony whereof, I, ADIEL Y; DODGE, sign this specification, ADIEL Y. DODGE.

arable ends of the friction means to apply 

